JPH11318565A - Toothbrush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress stimulation to soft tissues inside the mouth in brushing teeth by a scrubbing method, to increase the repulsive force of monofilaments, to improve bristle erection, to easily advance the monofilaments between the teeth and to flock the monofilaments without generating a crack at a filling hole. SOLUTION: The filling hole 2 for planting the bundle of the plural monofilaments 3 is in an oblong shape extended in the longitudinal direction of a handle 1. Then, the cross section of the monofilament 3 is rectangular, the long side of the cross section is made to be along the longitudinal direction of the filling hole 2 and the repulsive force of the monofilament at the time of brushing the teeth by the scrubbing method is increased. Also, both end parts in a handle longitudinal direction of a bristle bundle are curved in a streamline shape and contact resistance at the beginning of contact with the teeth is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush in which a monofilament bundle (hereinafter referred to as "hair bundle") is implanted in an implanted hole of a handle.

[0002]

2. Description of the Related Art A toothbrush cleans, ie, brushes, teeth in an oral cavity by the repulsive force of a monofilament of a bristle bundle implanted in a flocking hole of a handle. The greater the repulsive force, the higher the cleaning effect. . As a measure for increasing the repulsive force of the monofilament, it is generally practiced to increase the diameter of the monofilament having a circular cross section / harden the material of the monofilament. However, by increasing the diameter / hardening the material to make the monofilament firm, the stimulation of the tissue in the oral cavity due to the contact with the monofilament may be felt too strong, Sometimes it is difficult to reach the department.

[0003] As a brushing method, in place of the conventional rolling method in which the handle is rolled in the width direction to clean the teeth, in recent years, scrubbing in which the handle is reciprocated in the longitudinal direction in small increments to clean the teeth. The law has become mainstream.

As described in Japanese Utility Model Laid-Open Publication No. 63-163634, a toothbrush has a central curved portion of a monofilament whose central portion in the longitudinal direction is curved in each of the flocking holes of a handle having a plurality of flocking holes. Hair is implanted by driving a wire.

The flocking hole includes a round hole, an oval extending in the width direction of the handle, and an oval extending in the longitudinal direction of the handle. The monofilament has a circular or rectangular cross section. It has been known.

[0006] In a toothbrush having a round flocked hole, a bunch of monofilaments having a circular cross section is generally flocked, but as described in JP-T-Hei 8-502908, a round or rectangular flock is used. 2. Description of the Related Art A toothbrush in which a hair bundle of a monofilament having a rectangular cross section is implanted in a pore is known.

As shown in FIG. 6, the toothbrush includes a flat line 101 and a handle 1 arranged in the width direction of the handle 100.
A monofilament 103 having a rectangular cross-section and having a longer long side of the cross-section along the longitudinal direction of the flat wires 101 and 102. is there. Also, the handle 100
The cavity is formed by introducing and filling a synthetic resin material into the cavity of a molding die provided with a hole forming pin projecting into the cavity.

[0008] Further, as described above, the flat line for implanting the hair bundle into the flocked hole is formed longer than the size of the flocked hole, and both ends thereof are driven into the handle. In the case of a toothbrush arranged in the direction / longitudinal direction, when the flat line is arranged in the width direction / longitudinal direction of the handle, it is necessary to widen the interval between the flocking holes so that the handle is hard to be broken when the flat line is driven. There is.

Instead of widening the space between the flocking holes as described above, a toothbrush that can reduce the distance between the flocking holes by arranging a flat line crossing the longitudinal direction of the handle is also common. Is known to.

[0010]

However, in a toothbrush in which a monofilament bundle having a circular cross section is implanted in a circular implanted hole, when the diameter of the monofilament is increased to increase the repulsion of the monofilament, The stimulus may be strongly felt as a tactile sensation.

[0011] Further, in a toothbrush implanted with flat wires arranged in the width direction and the longitudinal direction of the handle, there is a problem that the workability of implanting the hair is poor because the flat wire is driven in two directions. .

In the case where a handle having a rectangular flocked hole for flocking a hair bundle of a monofilament having a rectangular cross section as shown in FIG. 7 is formed, the hole forming pin has a rectangular cross section corresponding to the flocked hole. When the molten synthetic resin material introduced and filled into the cavity 106 passes through the hole forming pin 107 as shown in FIG. 8, it is difficult for the molten synthetic resin material to flow along the flat surface of the hole forming pin 107, as a result. When the flat wire is driven in the longitudinal direction of the handle, the handle is liable to be broken from the resin-bonded portion, and furthermore, when the flat wire is driven in the longitudinal direction of the handle, the handle is easily broken. There is a problem that cracks easily occur.

In the case where the hair bundle is implanted in the elliptical implanted hole by a flat line arranged crossing the longitudinal direction of the handle,
As shown in FIG. 9, the densities of the monofilaments 109, 109 located on both sides of the flat line 108 become non-uniform, and high and low density portions are formed, resulting in poor hairiness and impairing the appearance of the toothbrush. . That is, the flat line 108
When the density of the monofilaments 109, 109 located on both sides of the monofilament becomes non-uniform, the monofilament of the high density part becomes uniform and tends to move to the lower density side in order to stabilize. Of the toothbrushes do not point in a direction perpendicular to the handle but in a diagonal direction, which impairs the appearance of the toothbrush.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has a flocked hole having an oval shape extending in the longitudinal direction of the handle, and a hair bundle of a monofilament having a rectangular cross section is formed in the flocked hole. By implanting the hair along the long side of the longer cross section in the longitudinal direction of the implanted hole, the repulsive force of the monofilament can be increased when brushing the teeth by the scrubbing method without increasing the stimulation of the tissue in the mouth. It is an object of the present invention to provide a toothbrush that can stand well, easily allow a monofilament to enter between teeth, and can implant a bristle bundle without generating cracks in the implanted holes.

[0015]

A toothbrush according to a first aspect of the present invention is a toothbrush in which a monofilament bundle is implanted in an oval implanted hole provided in a handle, wherein the implanted hole extends in a longitudinal direction of the handle. The monofilament has a rectangular cross section, and the longer side of the cross section extends along the longitudinal direction of the flocking hole.

According to the first aspect of the present invention, a bundle of monofilaments having a rectangular cross section is placed in a flocking hole extending in the longitudinal direction of the handle, and the longer side of the cross section is arranged along the longitudinal direction of the flocking hole. Therefore, when brushing by the scrubbing method, the repulsive force of the monofilament in the longitudinal direction can be increased, that is, when the handle is reciprocated in small increments in the longitudinal direction, the monofilament has the longer cross section. It can bend in the side direction to increase its repulsion,
This repulsive force allows the teeth to be satisfactorily polished, thereby increasing the cleaning effect. At this time, the stimulus felt in the oral cavity has a correlation with the cross-sectional area of the monofilament,
In the case of a circular or rectangular monofilament having the same repulsive force, the rectangular cross section has a smaller cross-sectional area, so that the stimulation is also smaller.

The oval-shaped flocking hole extends in the longitudinal direction of the handle, and a bristle bundle of a monofilament having a rectangular cross section is inserted into the flocking hole. Since the hairs are planted along the direction, both ends of the handle in the handle in the longitudinal direction can be curved in a streamlined manner, and the width of the curved top can be reduced, and the narrow curved top can contact the teeth. As a result, the contact resistance at the beginning of contact with the teeth can be reduced. Therefore, when brushing the teeth by the scrubbing method, the monofilaments at both ends in the longitudinal direction of the handle of the bristle bundle can easily enter between the teeth, and the repelling force of the monofilaments can be increased, and the cleaning effect can be further enhanced. That is, as described in Japanese Patent Application Laid-Open No. 8-502908, in a toothbrush in which a hair bundle of a monofilament having a rectangular cross section is implanted in a rectangular implanted hole, each side of the implanted hole is straight. As shown in FIG. 7, the monofilaments 105 implanted in the implanted holes 104 are arranged in parallel along each straight side, so that both ends in the handle longitudinal direction of the hair bundle are connected to the straight sides. The monofilament of this wide part comes into contact with the teeth at the same time, the contact resistance at the beginning of contact with the teeth is large, and the monofilaments at both ends in the longitudinal direction of the handle of the hair bundle enter between the teeth. On the contrary, in the present invention, the monofilament can easily enter between the teeth as described above.

Further, since the flocked hole extending in the longitudinal direction of the handle is oval, even when the hair bundle of the monofilament is implanted by driving a flat wire, the hair can be implanted without generating a crack in the implanted hole. .

In the toothbrush according to a second aspect of the present invention, the monofilament is linear, and a flat line that curves the central portion in the longitudinal direction and implants the hair into the flocking hole is disposed along the longitudinal direction of the flocking hole. It is characterized by the following. A toothbrush according to a third invention is characterized in that the flat line is arranged within ± 10 ° with respect to a center line along a longitudinal direction of the flocked hole.

According to the second and third aspects of the present invention, the flocking holes can be symmetrically divided from the central portion in the width direction by the flat wire, so that the bristle can be planted. Since the density of the monofilaments can be made uniform, the nap of the monofilaments can be improved, and the appearance of the toothbrush can be improved.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. 1 is an enlarged cross-sectional view of a flocked portion of the toothbrush, FIG. 2 is an enlarged cross-sectional view taken along line XX of FIG. 1, and FIG. 3 is a perspective view of the flocked portion.

In the toothbrush according to the embodiment, the grip portion (not shown) at one end and the flocking portion 11 at the other end are connected to the narrow connecting portion 12.
Oval flocking holes 2 extending in the longitudinal direction of the handle 1 in the flocking portion 11 of the synthetic resin handle 1 connected by
Are provided in total from the distal end side to the proximal end side of the flocking portion 11 so as to have one, two, three in total. Monofilament 3
Are implanted with the flat wire 4.

FIG. 4 is an explanatory view of a method of forming the handle 1. The handle 1 has a hole forming pin 50 having a cavity 51.
A molten synthetic resin material is introduced and filled into the cavity 51 of the molding die 5 provided so as to protrude into the mold 5 so as to be formed in a form having the flocking holes 2.

The flocked hole 2 extending in the longitudinal direction of the handle 1 may be oval as shown in FIG. 1 or may be substantially elliptical as shown in FIG. Should be fine.

The monofilament 3 is formed in a linear shape with a rectangular cross section, and the longer side of the cross section is arranged along the longitudinal direction of the flocking hole 2. The tip of the planted monofilament 3 has a rectangular shape as shown in FIG.
The portion that becomes the short side in plan view may be a semicircular curved shape or a substantially elliptical spherical shape, and further, the long side or the short side may be tapered, The shape of the tip is not particularly limited. The hair bundle formed by bundling the monofilaments 3 has a central portion in the longitudinal direction of the monofilament 3 curved in a U-shape by a flocking jig, and the central curved portion is planted in the flocking hole 2.

The flocking is performed by driving the flat wire 4 into the handle 1 along the longitudinal direction of the flocking hole 2, in other words, along the longitudinal direction of the handle 1, at the center of the flocking hole 2 in the width direction. . The flat line 4 is arranged within ± 10 ° with respect to a center line along the longitudinal direction of the flocking hole 2.

The handle 1 of the toothbrush constructed as described above has a first mold and a second mold having a cavity 51 for the handle 1 as shown in FIG.
The split mold is formed by filling a mold 5 provided with the hole forming pins 50 with a molten synthetic resin. In this case, since the hole forming pin 50 has an oval cross section corresponding to the flocking hole 2, the molten synthetic resin filled in the cavity 51 has a semicircular shape of the hole forming pin 50. It will flow smoothly along the curved surface.
As a result, the molten synthetic resin material is transferred to the hole forming pin 5.
Resin bonding when merging past 0 can be performed well, and the bonding strength can be increased. Therefore, the flat wire 4 is replaced with the flocking hole 2
The handle 1 can be prevented from breaking from the resin coupling portion when it is driven in the longitudinal direction of the flocking hole 2 in the width direction central portion. Further, both ends in the longitudinal direction of the oval flocking hole 2 are curved outward. Since there is no corner like the rectangular flocking hole shown in FIG. 7, it is possible to prevent the generation of cracks at both ends in the longitudinal direction of the flocking hole 2 when the bristle bundle is transplanted into the flocking hole 2.

The central portion of the curved monofilament 3 held in a U-shape in a flocking jig is pressed by a flat wire 4 from above into the flocking hole 2 of the formed handle 1.
Is implanted along the longitudinal direction of the flocking hole 2 at the central portion in the width direction of the flocking hole 2, so that the bristle bundle is implanted in the flocking hole 2.
In this case, in the monofilament 3 having a rectangular cross section, the longer side of the cross section is implanted along the longitudinal direction of the implanted hole.

Table 1 compares the repulsive force of the toothbrush according to the present invention and the conventional toothbrush. A is a general toothbrush having a large area of the flocked portion 11, and B is an area of the flocked portion 11. Is a toothbrush that is as small as about half of A, and C is a toothbrush according to the present invention in which the cross section of the monofilament 3 in B is rectangular. The repulsive force of the monofilament 3 is calculated according to the International Standard (ISO), and is a reaction force generated when a resistance is applied to a 1/3 length portion of the monofilament 3 and elastically deformed. It is represented by

[0030]

[Table 1]

As is clear from Table 1, according to the toothbrush C according to the present invention, the repulsive force in the longitudinal direction of the handle 1 per unit area and the longitudinal repulsion force with respect to the width direction are different from those of the toothbrushes of the above-mentioned A and B types. Since the repulsion ratio can be increased, the cleaning effect when brushing the teeth by the scrubbing method can be enhanced without increasing the stimulation of the tissue in the oral cavity.

Further, the flocked hole 2 is formed in an oval shape extending in the longitudinal direction of the handle 1, and a bristle bundle of a monofilament 3 having a rectangular cross section is planted in the flocked hole 2; Can be streamlined at both ends in the longitudinal direction, the width of the curved top can be narrowed, the teeth can be contacted from the narrow curved top, and the contact resistance at the beginning of contact with the teeth can be reduced. As a result, when brushing the teeth by the scrubbing method, the monofilaments 3 at both ends in the longitudinal direction of the handle of the bristle bundle can easily enter between the teeth, and the repelling force of the monofilaments 3 can be increased. it can.

Further, a flat line 4 is driven into the flocking hole 2 extending in the longitudinal direction of the handle 1 along the longitudinal direction of the flocking hole 2 at the center of the flocking hole 2 so that the flocking hole is symmetrical from the central portion in the width direction. Therefore, the density of the monofilaments 3 located on both sides of the flat wire 4 can be made uniform as shown in FIG. As a result, all of the monofilaments 3 can be directed substantially perpendicularly to the handle 1, so that the hair can be made good and the appearance of the toothbrush can be made good.

Table 2 shows the evaluation of hairiness (appearance) of the toothbrush according to the present invention and the conventional toothbrush at the time of flocking, wherein a to f are the conventional toothbrushes, and g is the toothbrush according to the present invention. And h is an example of the toothbrush according to the present invention in which the form of the flat wire 4 is changed.

[0035]

[Table 2]

As is clear from Table 2, when the flocking hole 2 is circular (see FIGS. 10a and 10b), the appearance of the toothbrush is not affected by the difference in the cross-sectional shape of the monofilament 3 and the shape of the flat wire 4. In addition, the appearance of the toothbrush can be improved when the hair bundle of the monofilament 3 having a circular cross section is implanted in the oblong implanted hole 2 by the flat wire 4 extending in the longitudinal direction of the handle 1.

In the case where a hair bundle of a monofilament having a circular cross section is implanted into the oblong implanted hole by a flat line intersecting the longitudinal direction of the handle (see FIG. 9), the implanted hole is asymmetrically divided by the flat line. In addition, when the hair bundle of a monofilament having a rectangular cross section is implanted into the oval implanted hole by a flat line intersecting the longitudinal direction of the handle, the implanted hair is asymmetrically formed by the flat line. The toothbrush g according to the present invention has a flat line 4 extending in the longitudinal direction of the flocked hole 2 with a bunch of monofilaments 3 having a rectangular cross section in the oval-shaped flocked hole 2. Therefore, the hair brushing hole 2 has an oval shape and the cross section is a monofilament 3 having a rectangular cross section.

[0038]

As described in detail above, according to the toothbrush according to the first aspect of the present invention, a monofilament having a rectangular cross section is inserted into an oval flocking hole extending in the longitudinal direction of the handle, and the longer side of the longer cross section is inserted. Since the hair is planted along the longitudinal direction of the planted hole, when brushing the tooth by the scrubbing method,
The repulsive force of the monofilament can be increased without increasing the stimulation of the tissue in the oral cavity, and the repulsive force allows the teeth to be satisfactorily brushed, thereby increasing the cleaning effect.

Moreover, since a monofilament having a rectangular cross section is implanted in the oblong implanted hole extending in the longitudinal direction of the handle, and the longer side of the cross section is arranged along the longitudinal direction of the implanted hole, the hair is implanted. The ends of the handle in the longitudinal direction of the bundle are curved in a streamlined manner, the width of the curved top can be reduced, and the teeth can be contacted from the narrow curved top, and the contact resistance at the start of contact with the teeth is reduced. Therefore, when brushing the teeth by the scrubbing method, it is easy to make the monofilaments at both ends in the longitudinal direction of the handle of the bristle bundle easily enter between the teeth, and the repelling force of the monofilaments can be increased. Can be higher.

Furthermore, since the flocked holes extending in the longitudinal direction of the handle are oval, even when the hair bundle of the monofilament is implanted by driving a flat wire, the hairs can be implanted without generating cracks in the flocked holes. .

According to the toothbrushes according to the second and third aspects of the present invention, the flocking holes can be symmetrically divided from the central portion in the width direction by the flat line, so that the cross sections located on both sides of the flat line are rectangular. Since the density of the monofilament in the shape can be made uniform, the hairiness of the monofilament can be improved and the appearance of the toothbrush can be improved.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a flocked portion of a toothbrush according to the present invention.

FIG. 2 is an enlarged sectional view taken along line XX of FIG.

FIG. 3 is a perspective view of a flocked portion of the toothbrush according to the present invention.

FIG. 4 is an explanatory view of a method for forming a handle of a toothbrush according to the present invention.

FIG. 5 is an enlarged cross-sectional view showing another embodiment of the flocking portion of the toothbrush according to the present invention.

FIG. 6 is a cross-sectional view of a toothbrush showing a conventional example.

FIG. 7 is an explanatory view showing a form of a flocked portion of a toothbrush showing a conventional example.

FIG. 8 is an explanatory view showing a method of forming a toothbrush showing a conventional example.

FIG. 9 is an enlarged cross-sectional view of a flocked portion of a toothbrush showing a conventional example.

FIG. 10 is an explanatory diagram showing a form of a flocked portion of a toothbrush showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 handle 2 flocking hole 3 monofilament 4 flat wire

Claims (3)

[Claims] 1. A toothbrush in which a monofilament bundle is implanted in an oval implanted hole provided in a handle,
The flocked hole extends in a longitudinal direction of the handle,
A toothbrush, wherein the monofilament has a rectangular cross section, and the longer side of the cross section extends along the longitudinal direction of the flocking hole. 2. The monofilament is straight,
The toothbrush according to claim 1, wherein a flat line that curves a central portion in the longitudinal direction and implants the hair into the flocking hole is disposed along the longitudinal direction of the flocking hole. 3. The toothbrush according to claim 2, wherein the flat line is disposed within ± 10 ° with respect to a center line along a longitudinal direction of the flocking hole.